Tandem compound engine.



No. 726,788. PATENTED APR. 28, 1903.

s. M. VAUGLAIN.

N TANDEM COMPOUND ENGINE,

" APPLICATION EIEED MAR. 7,1902.

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- s. M. VAUGLAIN."

TANDEM COMPOUND ENGINE; v

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No. 726,788. PATENTED APRL28, 1903.

' S. M. VAUGLAIN.

TANDEM COMPOUND ENGINE.

APPLICATION FILED mu. 1, 1902.

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ATENT CFFI E.

SAMUEL M. VAUOLAIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNDR TOBURNHAM,'WILLIAMS 82; COMPANY, OF PHILADELPHIA, PENNSYLVANIA,

A FIRM.

TANDEM COMPOUND ENGINE.

SPECIFICATION forming part of Letters Patent No. 726,788, datedAp'ri128', 1903. 7

Application filed March 7,1902. Serial No, 97,113. (No an.)

To all whom, it may concern.-

Be it known that I, SAMUEL M. VAUCLAIN, acitizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Tandem CompoundEngines, of which the following is aspecification.

The main object of my invention is to so construct a tandem compoundengine that the partition-head between the high and the low IO pressurecylinders can be secured in position without the use of internal bolts;and a further object of the invention is to so arrange the parts thatthe packing-casing is confined between two plates without the use ofinternal bolts. These objects I attain in the following manner,reference being had to the accompanying drawings, in which Figure l-is alongitudinal sectional view of v the high and low pressure cylinders andthe valve-chest of a tandem locomotive-engine. Fig. 2 is a transversesection on the line 2 2, Fig. 1. Fig. 3 is a transverse section on theline 3 3, Fig. 1; and Figs. 4 and 5 are detail views of the partitionand the packing used 2 5 between the high and low pressure cylinders.

A is the low-pressure cylinder of a tandem compound locomotive-engine.

B is the high-pressure cylinder.

D is the valve-chest common to both the high and low pressure cylinders.

E is the piston-rod.

E is the piston of the low-pressure engine, which is forced on the rodand is held in position by a nut e, and E is the piston of the 3 5high-pressure cylinder, also forced on the rod E and held in place by anut e.

A is the removable head of the low-pressure cylinder, having astuffing-box a of the ordinary type through which the piston-rod 40 Eextends.

B is the removable head of the high-pressure cylinder.

Mounted between the high and low pressure cylinders is the division-headF, in the present instance made up of two sections F F The section Fhasa recess f, in which is a stuffing-box 0, through which extends thereduced portion of the piston-rod E. The details of this stuffing-boxwill be described hereinafter.

In order to make an accurate fit between the partition and the cylinder,I form ground or finished bearings 02 cc, and I also form groundbearings y y between the two parts F F of the partition F.

In the present instance the high-pressure cylinder B and thelow-pressure cylinder A are formed in a single casting, the twocylinders being connected together by an annular wall A Stud-bolts Gextend through this wall, through the section F and into the section Fof the partition F, and a nut g on these bolts confines the saidsections rigidly to the wall A of the casting, dispensing with allinternal bolts or nuts, so that the bolts are accessible at all timesfrom the outside without dismantling the engine. Furthermore, theliability of a bolt or nut becoming loose and causing damage byobstructing the movement of either piston'is obviated. 7c

In order that access may be had to the series of bolts G situatedbetween the valvechest and the high-pressure cylinder,I make the passagecl, leading from the valve-chest D tothe rear end of the high-pressurecylinder B,,so that it will hug the valve-chest instead of hugging thecylinder in the ordinary manner. This leaves a clear opening H betweenthe casing of the passage and the valvechest and the casing of thehigh-pressure cyl- 8o 7 inder, as clearly understood on reference to thetransverse sectional'views, Figs. 2 and 3. The passage d, leading fromthe valve-chest D to the forward end of the high-pressure cylinder B,hugs said high-pressure cylinder in the ordinary manner. The metalsurrounding this port d is also used as a means of rigidly connectingthe valve-casing to the highpressure cylinder. The passages d d ,1eadingfrom the valve-chest to the low-pressure cylinder, are formed in theusual manner.

I is a valve-rod, and on thisval-ve-rod is the valve 1, controlling theadmission of live steam to the high-pressure cylinder and the exhaust ofsteam therefrom. Also on this 5 rod is a valve 1 controlling theadmission of steam to the low-pressure cylinder and exhaust ofsteamtherefrom.

The valve-chest in the present instance is one continuous chamber, inwhich are two I00 bushings j and j, having the ports thereincommunicating with the several passages d cl (1 (Z and with theinlet-passages d for the high-pressu re cylinder and the finalexhaustpassage (1 for the low-pressure cylinder.

The valves 1 1 are in the presentinstance cylindrical valves, havingopenings through the center, so as to form a sutficiently largeexpansion-chamber between the high and low pressure cylinders, and atthe same time the valves are perfectly balanced.

The ports (7. for the admission of live steam may be connected in theusual manner to the steam-supply pipe, and the exhaust-port (1 may alsobe connected to its passage in the usual manner.

While I may use any form of packing between the two sections F F of thepartitionhead F, I prefer to use the packing illustrated in Figs. 4 and5, which I will now proceed to describe.

The casing C has a back 0 and a coverplate 0', and mounted in the casingare the two segmental packing-sections 0 0 each backed by springs 0 andbetween these two segmental packing-sections c are blocks 0, in which ismounted suitable packing material 0 These parts 0 have segmentalbearing-surfaces, which fit the piston-rod, while the section a bearsagainst each side of the sections a.

The springs c tend to press the sections G against the piston-rod,sothat there is a steamtight joint between the high-pressure andlow-pressure cylinders. The springs maybe taken up by suitablescrew-plugs 0 The cap plate 0 has a bailed portion, against which theportion fof the section F of the partition rests, and there are springsf resting in cavities in the section F and these springs bear againstthe rear of the packing-box, as clearly illustrated in Fig. 4.-, so thatthe packing-box is held firmly against the seat f, and yet will havesufficient yield to allow the packing-box to accommodate itself to thepiston-rod.

I claim as my invention 1. The combination in a tandem compound engineof high and low pressure cylinders, a removable partition separatingsaid cylinders and constructed to be placed in position and removedtherefrom through the low-pressure cylinder, with means wholly exteriorof the cylinders for securing said partition in position, substantiallyas described.

2. The combination in a tandem compound engine of the high and lowpressure cylinders, a partition separating the said cylinders andconstructed to be placed in position or removed through one of saidcylinders, with a series of bolts securing said partition to thecylinder-casting, said bolts being accessible from the exterior,substantially as described.

3. The combination in a tandem compound engine, of the high andlowpressure cylinders, a partition separating the two cylinders, saidpartition being made of two sections, with bolts securing the twosections of the partition to the cylinder-casing, substantially asdescribed.

4-. The combination in a tandem compound engine, of a casting formingthe high and low pressure cylinders, a partition separating the twocylinders, said partition being made in two sections placedwithin saidcasting with bolts passing through the casting and one of the sectionsof the partition into the other section, said casting being constructedso that access can be had to said bolts from the exterior, substantiallyas described.

5. The combination in a tandem compound engine, of the high and lowpressure cylinders, a partition mounted between the two cylinders, saidpartition being made of two sections secured to the casing, a cavity inone section covered by the other section, with a stufiing-box for thepiston, said stufling-box being held in place by the other section ofthe partition, substantially as described.

6. The combination of a single cylindercasting having a high and a lowpressure cylinder therein arranged in tandem and having an annular wallintegral therewith and forming the connection between said twocylinders, a partition resting against the interior surface of said walland bolts passing from the exterior of the casting through the wall andinto the partition, substantially as described.

7. The combination in a cylinder-casting, of a high and low pressurecylinder therein arranged in tandem, an annular Wall connecting thehigh-pressure cylinder with the low-pressure cylinder, a partition madein two sections, said partition resting against the inner surface ofsaid wall, with external bolts passing through the wall and through onesection of the partition-plate and into the other, whereby the saidpartition-plates are held together and to the wall, substantially asdescribed.

8. The combination in a tandem compound engine, of a cylinder-casinghaving a high and low pressure cylinder therein, a valvechest for thehigh-pressure cylinder, passages forming communication between thevalvechest and with each end of the high-pressure cylinder, the forwardpassage arranged in close proximity to the valve-chest so as to leave afree opening between the high-pressure cylinder and the valve-chest andthe passage, with a detachable partition separating the high andlowpressure cylinders, and external bolts securing the said partition tothe casing, some of said bolts being within the clear opening so thataccess may be had to the bolts from the exterior, substantially asdescribed.

9. The combination in a tandem engine, of the high and low pressurecylinders, a detachable partition separating the said cylinders, avalve-chest common to both of said cylinders, passages leading from thesaid valve-chest to each end of the low-pressure ICC cylinder, passagesleading from the valvechest to each end of the high-pressure cylinder,one end of each passage hugging the valve-chest so as to form a clearopen space between the casing of the passage and valvechest and thecylinder, the other passage hugging the high-pressure cylinder andcommunicating with the rearend of said cylinder, and bolts securing thedetachable partition to the casing, some of said bolts being within theclear opening, substantially as described. 7

10. The combination in a tandem compound engine, of a cylinder-casting,a partition separating the high and low pressure cylinders, externalmeans for securing the partitionlin place, said partition being made intwo sections forming a cavity, a packingbox within the cavity andresting against a plate bearing on one section of the partition, withsprings mounted between the'box and the other section of the partition,sub sta'ntiallyas described. r i In testimony whereof I'have signed myname to thisspecification in the presence of two subscribing witnesses.I

SAMUEL M. VAUCLAIN.

Witnesses:

WILLIAM DE KRAFFT,- W. N. TUTTLE.

